<div class="modal-body">
	<button class="modal-close">close</button>
</div>
<style>
.modal-body{
	position:fixed;
	top:3em;
	bottom:3em;
	right:20%;
	left:20%;
	padding:2em 3em;
	background-color:white;
	overflow:auto;
}
.modal-close{
	position:absolute;
	top:0.3em;
	right:0.3em;
	padding:0.3em;
	cursor:pointer;
}
</style>